Radiation-Associated Chronic Dysphagia Assessment by Flexible Endoscopic Evaluation of Swallowing (FEES) in Head and Neck Cancer Patients: Swallowing-Related Structures and Radiation Dose-Volume Effect

Swallowing in advanced oral cancers: A prospective observational study

BACKGROUND

Advanced head and neck cancers are known to cause swallowing dysfunction due to anatomical and post-treatment changes. Literature is sparse on post-surgical and/or multi-modality therapy-associated swallowing function in advanced oral cancers. We conducted this study to longitudinally assess and compare the pre- and post-therapy swallowing dysfunction associated with locally advanced oral cancers.

METHODS AND MATERIAL

A prospective observational longitudinal study was conducted at a tertiary cancer center from 2017 to 2018 including treatment-naive cT4a oral cancer patients (AJCC 7th edition). The assessment was done pre-surgery, post-surgery, and post-adjuvant setting as per the scales (Dysphagia score, Penetration aspiration scale, and Yale pharyngeal residue (vallecular and pyriform fossa).

RESULTS

Of the 30 patients in the study, 47.4%, 47.4%, 52.6%, and 47.4% experienced deterioration of Dysphagia score, Penetration-Aspiration Scale (PAS), vallecula residue, and pyriform residue scores in the postoperative period. And 52.6%, 47.4%, 68.4%, and 57.9% had inferior dysphagia score, PAS, vallecula, and pyriform residue scores even 6 months after completion of adjuvant therapy. The dysphagia score correlated well with other objective assessment scores at different time points.

CONCLUSION

Swallowing functions are significantly affected by surgery and adjuvant therapy and continue to be affected even 6 months after completion of treatment. Appropriate rehabilitation and intervention must be offered to patients to reduce this problem. Dysphagia scores can predict the swallowing status similar to other objective assessments.

[Flexible endoscopic evaluation of swallowing in neurology]

BACKGROUND

Neurogenic dysphagia is a frequent symptom in a variety of neurological diseases. The establishment of the flexible endoscopic evaluation of swallowing (FEES) in the field of neurology has led to improvements in the diagnostics and treatment of patients with dysphagia.

OBJECTIVE

The aim of this review is to present the development of the FEES examination in the field of neurology. Furthermore, the additive value in the diagnostic classification of neurogenic dysphagia is elucidated and the impact on treatment management in patients with dysphagia is highlighted.

MATERIAL AND METHODS

Narrative literature review.

RESULTS

The FEES examination is a safe and well-tolerated method for the diagnostics of neurogenic dysphagia. It enables the valid investigation of the swallowing function within the very heterogeneous neurological patient population. It has become an important diagnostic tool, not only in the assessment of the severity of dysphagia and the risk of aspiration but also as a reliable method for the etiological classification of symptoms of deglutition disorders. As FEES can be performed at the bedside and does not require radiation exposure, it can be used not only to examine critically ill patients (point of care diagnostics) but also to monitor treatment.

CONCLUSION

The systematic endoscopic evaluation of swallowing is established as an important functional diagnostic tool in the field of neurology. Further developments to increase the use of FEES in clinically related disciplines such as neurosurgery, neuro-oncology or psychiatry are pending.

Radiation induced changes in profibrotic markers in the submental muscles and their correlation with tongue movement

Swallowing impairment is a major complication of radiation treatment for oropharyngeal cancers. Developing targeted therapies that improve swallowing outcomes relies on an understanding of the mechanisms that influence motor function after radiation treatment. The purpose of this study was to determine whether there is a correlation between radiation induced changes in tongue movement and structural changes in irradiated submental muscles, as well as assess other possible causes for dysfunction. We hypothesized that a clinically relevant total radiation dose to the submental muscles would result in: a) quantifiable changes in tongue strength and displacement during drinking two months post treatment; and b) a profibrotic response and/or fiber type transition in the irradiated tissue. Sprague-Dawley adult male rats received radiation to the submental muscles at total dose-volumes known to provoke dysphagia in humans. A clinical linear accelerator administered 8 fractions of 8Gy for a total of 64Gy. Comparisons were made to sham-treated rats that received anesthesia only. Swallowing function was assessed using videofluoroscopy and tongue strength was analyzed via force lickometer. TGFβ1 expression was analyzed via ELISA. The amount of total collagen was analyzed by picrosirius red staining. Immunofluorescence was used to assess fiber type composition and size. Significant changes in licking function during drinking were observed at two months post treatment, including a slower lick rate and reduced tongue protrusion during licking. In the mylohyoid muscle, significant increases in TGFβ1 protein expression were found post radiation. Significant increases in the percentage of collagen content were observed in the irradiated geniohyoid muscle. No changes in fiber type expression were observed. Results indicate a profibrotic transition within the irradiated swallowing muscles that contributes to tongue dysfunction post-radiation treatment.

Head and Neck Radiation Therapy Patterns of Practice Variability Identified as a Challenge to Real-World Big Data: Results From the Learning from Analysis of Multicentre Big Data Aggregation (LAMBDA) Consortium

Purpose

Outside of randomized clinical trials, it is difficult to develop clinically relevant evidence-based recommendations for radiation therapy (RT) practice guidelines owing to lack of comprehensive real-world data. To address this knowledge gap, we formed the Learning from Analysis of Multicenter Big Data Aggregation consortium to cooperatively implement RT data standardization, develop software solutions for data analysis, and recommend clinical practice change based on real-world data analyzed. The first phase of this "Big Data" study aimed at characterizing variability in clinical practice patterns of dosimetric data for organs at risk (OARs) that would undermine subsequent use of large-scale, electronically aggregated data to characterize associations with outcomes. Evidence from this study was used as the basis for practical recommendations to improve data quality.

Methods and Materials

Dosimetric details of patients with head and neck cancer treated with radiation therapy between 2014 and 2019 were analyzed. Institutional patterns of practice were characterized, including structure nomenclature, volumes, and frequency of contouring. Dose volume histogram (DVH) distributions were characterized and compared with institutional constraints and literature values.

Results

Plans for 4664 patients treated to a mean plan dose of 64.4 ± 13.2 Gy in 32 ± 4 fractions were aggregated. Before implementation of TG-263 guidelines in each institution, there was variability in OAR nomenclature across institutions and structures. With evidence from this study, we identified a targeted and practical set of recommendations aimed at improving the quality of real-world data.

Conclusions

Quantifying similarities and differences among institutions for OAR structures and DVH metrics is the launching point for next steps to investigate potential relationships between DVH parameters and patient outcomes.

Acute effects of radiation treatment to submental muscles on burrowing and swallowing behaviors in a rat model

Swallowing impairments are a major complication of radiation treatment for oropharyngeal cancers, influencing oral intake and quality of life. The timing and functional consequences of radiation treatment on the swallowing process is not clearly understood. A rodent radiation injury model was used to investigate the onset of oral and pharyngeal dysfunctions in deglutition related to radiation treatment. This study tested the hypothesis that (Wall et al., 2013) alterations in normal biting, licking, and swallowing performance would be measurable following 64Gy of fractionated radiation to the submental muscles; and (Kotz et al., 2004) radiation will affect the animal’s general well-being as measured via burrowing activity. Seven rats received radiation using a clinical linear accelerator given in 8 fractions of 8Gy and another seven animals received sham anesthesia only treatment. Swallowing bolus transit/size was assessed via videofluoroscopy, tongue movement during drinking was measured via an electrical lick sensor, and biting was analyzed from acoustic recordings of a vermicelli pasta test. Burrowing activity was measured by the amount of gravel substrate displaced within a container. Measurements were taken at baseline, during treatment (1–4 weeks), and after completion of treatment (weeks 5 & 6). Decreases in licking frequency and increases in inter-lick interval were observed 5- and 6-weeks post-treatment. Significant decreases in burrowing performance, swallowing frequency, and inter-swallow interval were observed starting the last week of treatment and continuing up to 2-weeks after completion. Results suggest that tongue dysfunction is one of the first treatment related feeding problems to present immediately after the completion of radiation to the submental muscles.

Upright epiglottis prevents aspiration in patients with nasopharyngeal carcinoma post-chemoradiation

NPC is the most widely found malignant tumor in the head and neck region in Indonesia. Chemoradiation therapy for NPC can induce swallowing disorders (dysphagia) that adversely affects a patients quality of life. This study aimed to assess the swallowing process by flexible endoscopic evaluation of swallowing in patients with nasopharyngeal carcinoma after chemoradiation. Thirty-nine patients with NPC who had chemoradiation therapy more than one month previously underwent flexible endoscopic evaluation of swallowing and were assessed for oral transport time, sensation, standing-secretion, pre-swallowing leakage, residue, penetration, aspiration, and silent aspiration. The most common structural abnormalities were an upright and swollen epiglottis (89.4%), poor oral hygiene, and velopharyngeal closure defects (56.4%). This examination also revealed a mild degree of standing secretion (38.5%) and aspiration (10.3%). No penetration was observed in 64.1% of the patients, and no silent aspiration was observed in any of the patients. A severe degree of residue (45.7%) was observed when administering oatmeal, while the residue was mild to moderate when administering gastric rice, crackers, and milk. The residue changed to a mild degree (32.3%-51.4%) in all food administrations after the watering maneuver. The highest penetration was noted after oatmeal administration (42.8%), and the highest aspiration was found after milk administration (8.6%). Standing secretion in almost all patients was caused by hyposensitivity of the hypopharynx. Persistent residue and hyposensitivity of the hypopharynx led to aspiration. The low percentage of aspiration and silent aspiration might have been caused by the upright and swollen epiglottis that prevented aspiration. Poor oral hygiene and a dry mouth led to prolonged oral transport. Therefore, most patients had hypopharyngeal abnormalities in the form of a swollen and upright epiglottis. Secretion and food residue were also detected. Drinking helps to expedite the swallowing process by facilitating oral phase transport and reducing residues.

Radiotherapy-Induced Digestive Injury: Diagnosis, Treatment and Mechanisms

Radiotherapy is one of the main therapeutic methods for treating cancer. The digestive system consists of the gastrointestinal tract and the accessory organs of digestion (the tongue, salivary glands, pancreas, liver and gallbladder). The digestive system is easily impaired during radiotherapy, especially in thoracic and abdominal radiotherapy. In this review, we introduce the physical classification, basic pathogenesis, clinical characteristics, predictive/diagnostic factors, and possible treatment targets of radiotherapy-induced digestive injury. Radiotherapy-induced digestive injury complies with the dose-volume effect and has a radiation-based organ correlation. Computed tomography (CT), MRI (magnetic resonance imaging), ultrasound (US) and endoscopy can help diagnose and evaluate the radiation-induced lesion level. The latest treatment approaches include improvement in radiotherapy (such as shielding, hydrogel spacers and dose distribution), stem cell transplantation and drug administration. Gut microbiota modulation may become a novel approach to relieving radiogenic gastrointestinal syndrome. Finally, we summarized the possible mechanisms involved in treatment, but they remain varied. Radionuclide-labeled targeting molecules (RLTMs) are promising for more precise radiotherapy. These advances contribute to our understanding of the assessment and treatment of radiation-induced digestive injury.

Pretreatment Adherence to a Priori-Defined Dietary Patterns Is Associated with Decreased Nutrition Impact Symptom Burden in Head and Neck Cancer Survivors

Dietary intake is understood to contribute to nutrition impact symptoms (NIS) in patients with head and neck squamous cell carcinoma (HNSCC). The purpose of this study was to evaluate the performance of four a priori-defined diet quality indices on the presence of NIS 1 year following diagnosis using data on 323 participants from the University of Michigan Head and Neck Specialized Program of Research Excellence (UM-SPORE). Pretreatment dietary intake was measured before treatment initiation using a food frequency questionnaire. NIS were measured along seven subdomains. Multivariable binary logistic regression models were constructed to evaluate relationships between pretreatment scores on a priori-defined diet quality indices (AHEI-2010, aMED, DASH, and a low-carbohydrate score) and the presence of individual symptoms in addition to a composite “symptom summary score” 1-year postdiagnosis. There were several significant associations between different indices and individual NIS. For the symptom summary score, there were significant inverse associations observed for aMED (OR_Q5-Q1: 0.36, 95% CI: 0.14–0.88, p_trend = 0.04) and DASH (OR_Q5-Q1: 0.38, 95% CI: 0.15–0.91, p_trend = 0.02) and the presence of NIS 1-year postdiagnosis. Higher adherence to the aMED and DASH diet quality indices before treatment may reduce NIS burden at 1-year postdiagnosis.

Prophylactic gastrostomy in locally advanced head and neck cancer: results of a national survey among radiation oncologists

BACKGROUND

Nutritional complications in patients with locally advanced head and neck cancer (LA-HNC) treated by concurrent chemoradiotherapy (CCRT) often lead to placement of a prophylactic gastrostomy (PG) tube, while indication lacks harmonization. Our aim was to explore the current PG tube utilization among Belgian radiation oncology centers.

METHODS

A survey was distributed to all 24 Belgian Radiation oncology departments, with questions about the number of patient treated per year, whether the PG indication is discussed at the multidisciplinary board, placement technique, time of starting nutrition and removal, its impact on swallowing function and importance of clinical factors. For the latter Relative Importance and Discordance Indexes were calculated to describe the ranking and agreement.

RESULTS

All 24 centers submitted the questionnaire. Twenty three treat more than 20 head and neck (HNC) patients per year, while four (1 in 21-50; 3 in 51-100) are not discussing the gastrostomy tube indication at the multidisciplinary board. For the latter, endoscopic placement (68%) is the dominant technique, followed by the radiologic (16%) and laparoscopic (16%) methods. Seventy-five percent start the enteral nutrition when clinically indicated, 17% immediately and 8% from the start of radiotherapy. Majority of specialists (19/24) keep the gastrostomy tube until the patient assume an adequate oral feeding. Fifteen centres are considering PG decrease swallowing function. Regarding factors and their importance in the decision for the PG, foreseen irradiated volume reached highest importance, followed by 'anatomical site', 'patients' choice' and 'postoperative versus definitive' and 'local expertise', with decreasing importance respectively. Disagreement indexes showed moderate variation.

CONCLUSIONS

The use of a PG tube for LAHNC patients treated by CCRT shows disparity at national level. Prospective studies are needed to ensure proper indication of this supportive measure.

Adaptations to Oral and Pharyngeal Swallowing Function Induced by Injury to the Mylohyoid Muscle

Muscle injury is a frequent side effect of radiation treatment for head and neck cancer. To understand the pathophysiology of injury-related dysfunction, we investigated the effects of a single muscle injury to the mylohyoid on oropharyngeal swallowing function in the rat. The mylohyoid protects the airway from food/liquid via hyolaryngeal elevation and plays an active role during both oral and pharyngeal swallowing. We hypothesized (1) that fibrosis to the mylohyoid alters swallowing bolus flow and licking patterns and (2) that injury to the mylohyoid changes normal activity of submental, laryngeal, and pharyngeal muscles during swallowing. A chilled cryoprobe was applied to the rat mylohyoid muscle to create a localized injury. One and two weeks after injury, swallowing bolus transit was assessed via videofluoroscopy and licking behavior via an electrical lick sensor. The motor activity of five swallow-related muscles was analyzed immediately after injury using electromyography (EMG). Comparisons were made pre- and post-injury. Fibrosis was confirmed in the mylohyoid at 2 weeks after injury by measuring collagen content. One week after injury, bolus size decreased, swallowing rate reduced, and licking patterns were altered. Immediately post-injury, there was a significant depression in mylohyoid and thyropharyngeus EMG amplitudes during swallowing. Our results demonstrated that injury to the mylohyoid is sufficient to cause changes in deglutition. These disruptions in oral and pharyngeal swallowing were detected prior to long-term fibrotic changes, including delays in tongue movement, alterations in bolus flow, and changes in sensorimotor function. Therefore, injuring a single important swallowing muscle can have dramatic clinical effects.

Pretreatment Dietary Patterns Are Associated with the Presence of Nutrition Impact Symptoms 1 Year after Diagnosis in Patients with Head and Neck Cancer

BACKGROUND

Dietary inflammatory potential could impact the presence and severity of chronic adverse treatment effects among patients with head and neck cancer. The objective of this study was to determine whether pretreatment dietary patterns are associated with nutrition impact symptoms (NIS) as self-reported 1 year after diagnosis.

METHODS

This was a longitudinal study of 336 patients with newly diagnosed head and neck cancer enrolled in the University of Michigan Head and Neck Specialized Program of Research Excellence. Principal component analysis was utilized to derive pretreatment dietary patterns from food frequency questionnaire data. Burden of seven NIS was self-reported 1 year after diagnosis. Associations between pretreatment dietary patterns and individual symptoms and a composite NIS summary score were examined with multivariable logistic regression models.

RESULTS

The two dietary patterns that emerged were prudent and Western. After adjusting for age, smoking status, body mass index, tumor site, cancer stage, calories, and human papillomavirus status, significant inverse associations were observed between the prudent pattern and difficulty chewing [OR 0.44; 95% confidence interval (CI), 0.21-0.93; P = 0.03], dysphagia of liquids (OR 0.38; 95% CI, 0.18-0.79; P = 0.009), dysphagia of solid foods (OR 0.46; 95% CI, 0.22-0.96; P = 0.03), mucositis (OR 0.48; 95% CI, 0.24-0.96; P = 0.03), and the NIS summary score (OR 0.45; 95% CI, 0.22-0.94; P = 0.03). No significant associations were observed between the Western pattern and NIS.

CONCLUSIONS

Consumption of a prudent diet before treatment may help reduce the risk of chronic NIS burden among head and neck cancer survivors.

IMPACT

Dietary interventions are needed to test whether consumption of a prudent dietary pattern before and during head and neck cancer treatment results in reduced NIS burden.